Sterilizer



FIG. 1 is a front, right perspective view of the sterilizer showing our new design;

FIG. 2 is a rear, left, bottom perspective view thereof; and,

FIG. 3 is a front, left perspective view thereof showing the door on the front in a half-open position.

The top of the sterilizer forms no part of the claimed design. 

The ornamental design for a sterilizer, as shown and described. 